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In hydraulic pump, fluid enters the pump at a specific velocity and pressure. However, the fluid may leave the pump at higher velocity and pressure For this purpose, the pump consumes an amount of energy from any external source. Now inside the pump, there are rotating components which moves the fluid either by imparting energy to the fluid through dynamic action of the moving components thereby increasing velocity and pressure of the fluid or by confining it in definite volumes and then displacing it.

The main purpose of a hydraulic pump is to provide fluid flow. A pump within the hydraulic system converts mechanical energy into hydraulic energy. The pump is designed to fix either flow or pressure, while all other parameters are allowed to swing with the load. By fixing the pump flow, the pressure increases as the load restriction is increased. Conversely, the flow goes decreases with an increase in load restriction when the pump delivers fixed pressure.

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